linux-kernel - Re: [PATCH] drm/i2c: Fix broken TDA998x audio (was: Re: [PATCH v2 5/8] drm/i2c: tda998x: add video and audio input configuration)

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Date:	Sun, 22 Sep 2013 22:53:42 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	David Airlie <airlied@...ux.ie>,
	Darren Etheridge <detheridge@...com>,
	Rob Clark <robdclark@...il.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i2c: Fix broken TDA998x audio (was: Re: [PATCH v2
	5/8] drm/i2c: tda998x: add video and audio input configuration)

Ping?

On Mon, Sep 02, 2013 at 03:50:57PM +0100, Russell King - ARM Linux wrote:
> On Wed, Aug 14, 2013 at 09:43:30PM +0200, Sebastian Hesselbarth wrote:
> > From: Russell King <rmk+kernel@....linux.org.uk>
> > 
> > This patch adds tda998x specific parameters to allow it to be configured
> > for different boards using it. Also, this implements rudimentary audio
> > support for S/PDIF attached controllers.
> > 
> > Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
> > Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
> > Tested-by: Darren Etheridge <detheridge@...com>
> > ---
> 
> It looks like there's been a bug introduced in this patch (which wasn't
> in my original).
> 
> > @@ -445,8 +681,7 @@ tda998x_encoder_dpms(struct drm_encoder *encoder, int mode)
> >  
> >  	switch (mode) {
> >  	case DRM_MODE_DPMS_ON:
> > -		/* enable audio and video ports */
> > -		reg_write(encoder, REG_ENA_AP, 0xff);
> > +		/* enable video ports, audio will be enabled later */
> >  		reg_write(encoder, REG_ENA_VP_0, 0xff);
> >  		reg_write(encoder, REG_ENA_VP_1, 0xff);
> >  		reg_write(encoder, REG_ENA_VP_2, 0xff);
> 
> I also disabled the writing to REG_ENA_AP in the DPMS off path as well,
> which clears this register.
> 
> That seems to be missing from this patch, and it means that when the
> display is placed into DPMS-off mode, the audio inputs are disabled,
> never to be re-enabled.  There is no need to disable the audio input
> in DPMS-off mode.
> 
> 8<=============
> From: Russell King <rmk+kernel@....linux.org.uk>
> Subject: [PATCH] drm/i2c: Fix broken TDA998x audio
> 
> In patch "drm/i2c: tda998x: add video and audio input configuration" in
> its original version, disabling the audio input port was removed.  The
> version which was submitted for merging had this change deleted, which
> results in audio being non-functional.  Fix this by removing the write.
> While here, update the comment too.
> 
> Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
> --- 
>  drivers/gpu/drm/i2c/tda998x_drv.c |    3 +--
>  1 files changed, 1 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
> index 5742cfc..59878af 100644
> --- a/drivers/gpu/drm/i2c/tda998x_drv.c
> +++ b/drivers/gpu/drm/i2c/tda998x_drv.c
> @@ -705,8 +705,7 @@ tda998x_encoder_dpms(struct drm_encoder *encoder, int mode)
>  		reg_write(encoder, REG_VIP_CNTRL_2, priv->vip_cntrl_2);
>  		break;
>  	case DRM_MODE_DPMS_OFF:
> -		/* disable audio and video ports */
> -		reg_write(encoder, REG_ENA_AP, 0x00);
> +		/* disable video ports */
>  		reg_write(encoder, REG_ENA_VP_0, 0x00);
>  		reg_write(encoder, REG_ENA_VP_1, 0x00);
>  		reg_write(encoder, REG_ENA_VP_2, 0x00);
--
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